What is the purpose of sanitary drainage systems according to the UPC?

The purpose of sanitary drainage systems, as outlined by the Uniform Plumbing Code (UPC), is primarily to convey sewage and graywater for treatment. This system is designed to transport waste from bathrooms, kitchens, and other areas where water is used, directing it safely away from buildings to treatment facilities or disposal points.

By effectively managing waste, sanitary drainage systems play a crucial role in public health and environmental protection. They prevent the contamination of potable water sources and ensure that wastewater is properly handled to avoid unsanitary conditions.

The other options are not aligned with the function of the sanitary drainage system. For instance, filtering drinking water pertains to processes related to water purification or treatment rather than waste transport. Supplying clean water to fixtures is the role of the water supply system, and increasing pressure in plumbing systems relates to the distribution of water rather than the drainage of waste. Thus, the main focus of sanitary drainage systems is their ability to manage and transport sewage and graywater.